Crankshaft rotating angle controlling system for controlling crankshaft rotating angle and crankshaft rotating angle controlling method for controlling the same

Abstract

A crankshaft rotating angle controlling method and a crankshaft rotating angle controlling system are provided. A shut-off signal is obtained, and an engine speed is judged. If the engine speed is lower than a specific value, a generator is set in a driving mode at an ending point of a missing tooth signal in a gear pulse signal, such that the generator in the driving mode drives a crankshaft to exceed a top-dead-center of a cylinder. When the crankshaft arrives at a bottom-dead-center of the cylinder, the generator is set to be in a holding mode of an error phase of a three-phase current. Through the generator in the driving mode, the given error phase of the three-phase current stops the generator immediately and the crankshaft is fixed within an angle range of a default stop position.

What is claimed is: 
     
       1. A crankshaft rotating angle controlling system, comprising:
 an engine that provides a gear pulse signal and a top-dead-center judging signal; 
 a generator that provides three-phase Hall signals; 
 a vehicle control unit that provides a shut-off signal; and 
 a driving controller connected to the engine, the generator and the vehicle control unit, further comprising:
 a pulse width modulation unit; 
 a power signal gate for controlling an action of the pulse width modulation unit to control a current output from a battery; and 
 a calculating unit for receiving the shut-off signal, the top-dead-center judging signal, the gear pulse signal and the three-phase Hall signals, so as to obtain a top-dead-center and a bottom-dead-center of a crankshaft of the engine according to the gear pulse signal and the top-dead-center judging signal, wherein the power signal gate is opened as the crankshaft reaches the top-dead-center, the power signal gate is closed after the crankshaft exceeds the top-dead-center and makes the pulse width modulation unit change a sequence of the three-phase Hall signals to secure the crankshaft in position. 
 
 
     
     
       2. The crankshaft rotating angle controlling system of  claim 1 , wherein the top-dead-center judging signal is a cam signal, a controller local network signal, a crankshaft rotating angle speed variation signal, a manifold absolute pressure sensor signal or an ignition current sensing signal. 
     
     
       3. The crankshaft rotating angle controlling system of  claim 1 , wherein the calculating unit closes the power signal gate at an ending point of a missing tooth signal in the gear pulse signal when an engine speed of the engine is lower than a specific value, so as to enable the battery to output a current to the generator and drive the crankshaft of the engine to achieve or exceed the top-dead-center. 
     
     
       4. The crankshaft rotating angle controlling system of  claim 3 , wherein the specific value is determined by a torque that the crankshaft can achieve or exceed the top-dead-center, and remaining inertia of the engine speed from the specific value to zero. 
     
     
       5. The crankshaft rotating angle controlling system of  claim 1 , wherein the engine and the generator are co-axial. 
     
     
       6. The crankshaft rotating angle controlling system of  claim 1 , wherein the top-dead-center is referred to a top-dead-center between a compression stroke and a power stroke. 
     
     
       7. The crankshaft rotating angle controlling system of  claim 1 , wherein the bottom-dead-center is referred to a bottom-dead-center between a power stroke and an exhaust stroke. 
     
     
       8. The crankshaft rotating angle controlling system of  claim 1 , wherein the generator uses a Hall sensor, a decoder or a resolver to provide the three-phase Hall signals. 
     
     
       9. The crankshaft rotating angle controlling system of  claim 1 , wherein the battery is a solar battery, a fuel battery or a secondary battery. 
     
     
       10. The crankshaft rotating angle controlling system of  claim 1 , wherein the calculating unit, when receiving the shut-off signal, controls the driving controller to open the power signal gate, such that the pulse width modulation unit is inactive, and the battery does not output a current. 
     
     
       11. The crankshaft rotating angle controlling system of  claim 1 , wherein the pulse width modulation unit converts an analog signal into a pulse width modulation signal and outputs the pulse width modulation signal, and the power signal gate controls the pulse width modulation unit to control the battery to output a current. 
     
     
       12. The crankshaft rotating angle controlling system of  claim 1 , wherein the calculating unit, when the crankshaft is fixed in position, determines whether a number of seconds when the crankshaft is fixed in position is greater than a specific number of seconds, and opens the power signal gate and initiates the pulse width modulation unit to recovery the order of the three-phase Hall signals when the number of seconds is greater than the specific number of seconds. 
     
     
       13. A crankshaft rotating angle controlling method, which is applicable to an engine, for controlling a crankshaft rotating angle, comprising:
 obtaining shut-off signals, and then obtaining a top-dead-center and a bottom-dead-center of a crankshaft of the engine in accordance with a gear pulse signal and a top-dead-center judging signal of the engine; 
 judging whether an engine speed of the engine is lower than a specific value, if so, setting a generator of the engine in a driving mode at an ending point of a missing tooth signal in the gear pulse signal; and 
 setting the generator in a standby mode according to the top-dead-center judging signal when the crankshaft arrives at the top-dead-center, and setting the generator in a holding mode to secure the crankshaft in position after the crankshaft further exceeds top-dead-center. 
 
     
     
       14. The crankshaft rotating angle controlling method of  claim 13 , wherein the top-dead-center judging signal is a cam signal, a controller local network signal, a crankshaft rotating angle speed variation signal, a manifold absolute pressure sensor signal or an ignition current sensing signal. 
     
     
       15. The crankshaft rotating angle controlling method of  claim 14 , wherein the top-dead-center and the bottom-dead-center of the crankshaft of the engine are detected by converting a mechanical angle of the engine into an electrical angle of the generator, identifying a position of the top-dead-center according to a pulse signal of the cam signal, and controlling a position of the crankshaft of the engine according to the electrical signal. 
     
     
       16. The crankshaft rotating angle controlling method of  claim 15 , wherein the electrical angle of the generator is calculated by three-phase Hall signals of the generator. 
     
     
       17. The crankshaft rotating angle controlling method of  claim 13 , further comprising, after obtaining the shut-off signal, setting the generator of the engine in the standby mode. 
     
     
       18. The crankshaft rotating angle controlling method of  claim 13 , wherein the top-dead-center is referred to a top-dead-center between a compression stroke and a power stroke. 
     
     
       19. The crankshaft rotating angle controlling method of  claim 13 , wherein the bottom-dead-center is referred to a bottom-dead-center between a power stroke and an exhaust stroke. 
     
     
       20. The crankshaft rotating angle controlling method of  claim 13 , wherein the engine and the generator are co-axial. 
     
     
       21. The crankshaft rotating angle controlling method of  claim 13 , wherein the battery provides a current to drive the crankshaft to achieve or exceed the top-dead-center after the generator of the engine is set in the driving mode. 
     
     
       22. The crankshaft rotating angle controlling method of  claim 21 , wherein the specific value is determined by a torque that the crankshaft can achieve or exceed the top-dead-center and remaining inertia of the engine speed from the specific value to zero. 
     
     
       23. The crankshaft rotating angle controlling method of  claim 13 , wherein the generator in the standby mode is not driven or does not generate electric power. 
     
     
       24. The crankshaft rotating angle controlling method of  claim 13 , wherein the holding mode of the generator is referred to changing an order of three-phase Hall signals that are pulse-width modulated, and magnetic fields of the generator interlace temporarily. 
     
     
       25. The crankshaft rotating angle controlling method of  claim 13 , further comprising, after the generator is set in the holding mode, determining whether a number of seconds that the crankshaft is fixed in position when the generator is in the holding mode, is greater than a specific number of seconds, and setting the generator to be in the standby mode if the number of seconds is greater than the specific number of seconds.